. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 398 KAO AND E. S. CHANG. Figure 3. Claw regenerated from Cancer jordani eye sockets. (A) Complete claw regenerated from the eye socket after the second postoperative molt (M2). (B) Incomplete claw with all segments proximal to the claw digits regenerated after M2. resulted from contralateral autotransplantation of both claw digits and had host-site handedness. Like an authen- tic claw, it contained five segments. The incomplete claw (Fig. 3B) resulted from contralateral autotransplantation of the claw pollex and had do
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 398 KAO AND E. S. CHANG. Figure 3. Claw regenerated from Cancer jordani eye sockets. (A) Complete claw regenerated from the eye socket after the second postoperative molt (M2). (B) Incomplete claw with all segments proximal to the claw digits regenerated after M2. resulted from contralateral autotransplantation of both claw digits and had host-site handedness. Like an authen- tic claw, it contained five segments. The incomplete claw (Fig. 3B) resulted from contralateral autotransplantation of the claw pollex and had donor-tissue handedness. It had a fork-shaped structure at the distal tip and four normal proximal segments. The fork-shaped structure was regen- erated first, and the proximal segments were regenerated in subsequent molts. All sham-operated animals failed to regenerate limbs in eye sockets. Discussion Kim and Stocum (1986) autografted anterior or poste- rior halves of axolotl forearms to eye sockets and ampu- tated them distally 7 days later. The transplants could not regenerate proximal structures of the limbs. They either regressed until a small fragment of the radius remained in the orbit or regenerated no more than two digits distally. Pecorino el al. (1996) transplanted the hindlimb distal blastema to the forelimb proximal stumps of newt limbs. The proximal part of the regenerate was mostly generated by the stump, and the transplanted cells made only a Table II Siiiiiniiiiy of limb tissue autotransplantation in the eye socket of Cancer jordani (carapace width = ± nun) Trials Survival Donor tissue Host eye (No.) (No.) Claw pollex contra 1 1 1 dactyl + pollex contra 8 4 1 Sham operation contra 3 2 1 minor contribution. These results, together with older studies (Dent. 1954; Butler, 1955). indicate that amphib- ian limbs can regenerate distally but not proximally, and they are consistent with the distalization rule of the polar coordinate model (Bryant et al., 1981
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